sample-hf.js

const LETTERS = 'acdfgilmnoprstuw';
const HASH = 7;

function hash(s) {
  let hash = HASH;
  for (let i = 0; i < s.length; i++) {
    hash = (hash * 23 + LETTERS.indexOf(s[i]));
  }
  return hash;
}

function unhash(num) {
  const letters = [];
  while (num > 7) {
    letters.push(LETTERS[num % 23]);
    num = parseInt(num / 23, 10);
  }
  return letters.reverse().join('');
}

const test1_num = hash('tortilla');
const test1_str = unhash(test1_num);

console.assert('tortilla' === test1_str, {test1_num, test1_str});

const test2_num = 292681030017238;
const test2_str = unhash(test2_num);
console.log(`num ${test2_num} unhashed is ${test2_str}`);

// crowdgifts